. Railroad structures and estimates . at did not require figures given are from the bottom of footing to top of wall ineach case. TABLE 49. —APPROXIMATE ESTIMATE OF COST PER LINEAL FOOT OF WALL. Items. Section wall (22 in. 6 ft. high). Section wall (25 ft. high). Excavation Backfill Piles (wood) Drainage Concrete, plain Steel reinforcement. Waterproofing Supervision 3 cu. yds. H cu. lin. lin. ft. cu. lbs. 3 sq. (about) Total cost per lineal foot of $ 5 3 012 130. 7. 0. 5. $61 00750000405075
. Railroad structures and estimates . at did not require figures given are from the bottom of footing to top of wall ineach case. TABLE 49. —APPROXIMATE ESTIMATE OF COST PER LINEAL FOOT OF WALL. Items. Section wall (22 in. 6 ft. high). Section wall (25 ft. high). Excavation Backfill Piles (wood) Drainage Concrete, plain Steel reinforcement. Waterproofing Supervision 3 cu. yds. H cu. lin. lin. ft. cu. lbs. 3 sq. (about) Total cost per lineal foot of $ 5 3 012 130. 7. 0. 5. $61 007500004050756000 3 cu. yds. 1^ cu. lin. lin. cu. lbs. 3 sq. (about) $ J $ CRIB WORK. 99 Crib Work. — For cheap first cost or temporary constructionacross or alongside water fronts or embankments, or for abut-ments, piers, dams, retaining walls, wharves, etc., wooden cribsare used extensively. Figs. 20, 21, and 22. CRIB ABUTMENTS AND PIERS. k -12:tal6 ft. ctntres >j 12 to IS-ft. centiefl >\ I M Must not belless than 61 Fig. 20. The bottoms of the cribs are constructed to suit the irregu-larities or unevenness of the ground, any deposit or obstructionin the bottom being removed so that a section when sunk inplace will take an even bearing throughout; when filled withballast the top of the crib should be reasonably straight and ingood alignment. Sometimes the portion under low water levelis built of several cribs, piles being driven on the outer line ofthe work against which the cribs may be floated and sunk, theguide piles being cut off below low water after the work is com-pleted. Construction. — The timbers are usually cedar under waterand tamarac above with bark removed; the outer timbers arehewn or sawn perfectly true and parallel on two opposite sidesto a face of at least 9 inches, and from 10 to 12 inches thick, thejoints made as close as possible without dressing and so
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